Re-land "aggregate.py: add tab format (#6405)", reverted in #6424 (#6… #4624

Job	Run time
Build XLA / build	1h 0m 2s
GPU tests / test (benchmark_tests)	13m 7s
Build & publish docs / push-docs	10m 2s
GPU tests / test (cpp_tests1)	20m 42s
GPU tests / test (cpp_tests2)	31m 2s
GPU tests / test (python_tests, xla_op1)	30m 36s
CPU tests / test (benchmark_tests)	10m 49s
GPU tests / test (python_tests, xla_op2)	13m 6s
CPU tests / test (cpp_tests1)	15m 25s
GPU tests / test (python_tests, xla_op3)	15m 45s
CPU tests / test (cpp_tests2)	16m 57s
GPU tests / test (python, torch_mp_op)	34m 6s
CPU tests / test (python_tests, xla_op1)	18m 48s
CPU tests / test (python_tests, xla_op2)	10m 45s
CPU tests / test (python_tests, xla_op3)	12m 12s
CPU tests / test (python, torch_mp_op)	18m 24s
	5h 31m 48s

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